KexAlgorithms

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KexAlgorithms (Key Exchange Algorithms)

ssh -Q kex
ssh -Q kex SERVER

ssh -Q kex
diffie-hellman-group1-sha1
diffie-hellman-group14-sha1
diffie-hellman-group14-sha256
diffie-hellman-group16-sha512
diffie-hellman-group18-sha512
diffie-hellman-group-exchange-sha1
diffie-hellman-group-exchange-sha256
ecdh-sha2-nistp256
ecdh-sha2-nistp384
ecdh-sha2-nistp521
curve25519-sha256
[email protected]
[email protected]

ssh -Q kex SERVER
diffie-hellman-group1-sha1
diffie-hellman-group14-sha1
diffie-hellman-group14-sha256
diffie-hellman-group16-sha512
diffie-hellman-group18-sha512
diffie-hellman-group-exchange-sha1
diffie-hellman-group-exchange-sha256
ecdh-sha2-nistp256
ecdh-sha2-nistp384
ecdh-sha2-nistp521
curve25519-sha256
[email protected]
[email protected]

Unable to negotiate with

ssh -oKexAlgorithms=+diffie-hellman-group14-sha1 username@hotstname
ssh -oHostKeyAlgorithms=-ssh-rsa user@host

/etc/ssh/ssh_config
KexAlgorithms +diffie-hellman-group14-sha1

Related terms

Key exchange method (KEX)

See also

KEX, KexAlgorithms, Diffie–Hellman, PSK, Elliptic-curve Diffie–Hellman (ECDH)
SSH: ssh, TLS, .ppk, .pem, .crt, .pub, ED25519, Key exchange method (KEX), public key, private key, ssh -Q kex, IAMUserSSHKeys, known_hosts, ssh tunnel, Dropbear
sshd, sshd logs, sshd -t, sshd -T, sshd_config, sftp

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